How large a number can I convert?

The tool uses JavaScript BigInt, so it supports numbers of virtually unlimited size — far beyond the 64-bit limit of regular numbers.

What characters are valid for each base?

Binary: 0-1. Octal: 0-7. Decimal: 0-9. Hexadecimal: 0-9 and A-F (case insensitive).

Does it handle negative numbers?

Currently the tool supports non-negative integers. For negative numbers, convert the absolute value and apply the sign or two's complement manually.

What is the Text to Binary section?

It converts each character of your text into its ASCII decimal value, 8-bit binary, and 2-digit hex representation — useful for understanding character encoding.

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Binary, Hex & Octal Converter

Convert numbers between binary, decimal, octal, and hexadecimal instantly.

Updated Mar 2026100% Private — runs in browser

Number Base Converter

Convert between decimal, binary, octal, and hexadecimal in real time. Supports arbitrarily large numbers.

Quick examples

Decimal (Base 10)

Binary (Base 2)

Octal (Base 8)

Hexadecimal (Base 16)

Text to Binary / Hex

How to Use Binary, Hex & Octal Converter

1
Type a number in any field (decimal, binary, octal, or hex).
2
All other fields update instantly in real time.
3
Use quick example chips to explore common values.
4
Check the info cards for bit count, nibble/byte grouping, and size fit.
5
Use the Text to Binary section to see character codes for any text.

About Binary, Hex & Octal Converter

Convert numbers between binary, decimal, octal, and hexadecimal in real time. Type in any field and all other representations update instantly — no button clicks needed.

Key Features

Real-Time Conversion: All four bases (binary, decimal, octal, hex) update simultaneously as you type.
BigInt Support: Handles arbitrarily large numbers beyond the 64-bit limit.
Bit Analysis: Shows nibble and byte groupings, total bits needed, and 8/16/32/64-bit fit status.
Quick Examples: Chips for common values (255, 1024, 65535) for quick exploration.
Text to Binary: Convert any text to see each character's ASCII code, binary, and hex in a table.

Who Is This For?

Perfect for programmers working with low-level data, CS students learning number systems, and anyone debugging binary or hex values.

Privacy & Security

All conversions run instantly in your browser — no data stored, no signup required.